mirror of
https://github.com/python/cpython.git
synced 2024-11-26 19:34:19 +08:00
49 lines
1.8 KiB
TeX
49 lines
1.8 KiB
TeX
\section{\module{hmac} ---
|
|
Keyed-Hashing for Message Authentication}
|
|
|
|
\declaremodule{standard}{hmac}
|
|
\modulesynopsis{Keyed-Hashing for Message Authentication (HMAC)
|
|
implementation for Python.}
|
|
\moduleauthor{Gerhard H{\"a}ring}{ghaering@users.sourceforge.net}
|
|
\sectionauthor{Gerhard H{\"a}ring}{ghaering@users.sourceforge.net}
|
|
|
|
\versionadded{2.2}
|
|
|
|
This module implements the HMAC algorithm as described by \rfc{2104}.
|
|
|
|
\begin{funcdesc}{new}{key\optional{, msg\optional{, digestmod}}}
|
|
Return a new hmac object. If \var{msg} is present, the method call
|
|
\code{update(\var{msg})} is made. \var{digestmod} is the digest
|
|
module for the HMAC object to use. It defaults to the
|
|
\refmodule{md5} module.
|
|
\end{funcdesc}
|
|
|
|
An HMAC object has the following methods:
|
|
|
|
\begin{methoddesc}[hmac]{update}{msg}
|
|
Update the hmac object with the string \var{msg}. Repeated calls
|
|
are equivalent to a single call with the concatenation of all the
|
|
arguments: \code{m.update(a); m.update(b)} is equivalent to
|
|
\code{m.update(a + b)}.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}[hmac]{digest}{}
|
|
Return the digest of the strings passed to the \method{update()}
|
|
method so far. This is a 16-byte string (for \refmodule{md5}) or a
|
|
20-byte string (for \refmodule{sha}) which may contain non-\ASCII{}
|
|
characters, including NUL bytes.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}[hmac]{hexdigest}{}
|
|
Like \method{digest()} except the digest is returned as a string of
|
|
length 32 for \refmodule{md5} (40 for \refmodule{sha}), containing
|
|
only hexadecimal digits. This may be used to exchange the value
|
|
safely in email or other non-binary environments.
|
|
\end{methoddesc}
|
|
|
|
\begin{methoddesc}[hmac]{copy}{}
|
|
Return a copy (``clone'') of the hmac object. This can be used to
|
|
efficiently compute the digests of strings that share a common
|
|
initial substring.
|
|
\end{methoddesc}
|